Bought this game a long time ago. Was hooked at first until I got all the achievements, and now I keep playing it once every few weeks. Steam says I've played it for 23 hours, which is not bad... It's not a game for everyone though, so if you aren't a sucker for this kind of puzzle games, you will most likely dislike it.

The only problem I have is that it feels slightly buggy: sometimes if you survive for a lot of time, the game goes faster and faster and sounds start to queue up, eventually making the game slow down.
Definitely there are better and more polished games out there, but I think it's still entertaining and worth playing...